The 3RT2037-3AB00-Z W96 is a Siemens SIRIUS size S2 power contactor rated 65 A in AC-3e/AC-3 duty, which means it switches three-phase motor loads up to 30 kW at 400 V — the AC-3 category covers starting and plugging of squirrel-cage motors, so this is the number that governs real motor switching, not the higher resistive-heating AC-1 rating. The 24 V AC 50 Hz coil is frequency-specific; a 60 Hz supply will change coil impedance and may cause dropout or overheating, so verify your control transformer matches 50 Hz.
Terminal configuration to note
Main circuit uses screw terminals, while the control and auxiliary circuit uses spring-loaded (cage-clamp) terminals. That split means the power wiring gets a traditional screw clamp — fine for lugs or ring terminals — but the coil and aux wiring needs a ferrule or solid conductor for the spring cage. Strip length and wire gauge for the spring side follow the standard 0.25–2.5 mm² range for SIRIUS aux terminals.
Panel integration
The 122.5 x 62 x 142 mm envelope fits alongside other SIRIUS S2 devices — contactors, overload relays, soft starters — on the same rail. Auxiliary contact block (1 NO + 1 NC) is built in; additional front- or side-mount aux blocks can be added without losing DIN space.